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Three-Dimensional Optimal Spectral Extraction (TDOSE) from integral field spectroscopy
Inami, H.; Schmidt, K. B.; Krajnović, D. +8 more
The amount of integral field spectrograph (IFS) data has grown considerably over the last few decades. The demand for tools to analyze such data is therefore bigger now than ever. We present a flexible Python tool for Three-Dimensional Optimal Spectral Extraction (TDOSE) from IFS data cubes. TDOSE works on any three-dimensional data cube and bases…
SPLOT: a snapshot survey for polarized light in optical transients
Covino, S.; Hodgkin, S. T.; Wyrzykowski, Ł. +7 more
We present SPLOT, a small-scale pilot survey to test the potential of snapshot (single epoch) linear imaging polarimetry as a supplementary tool to traditional transient follow-up. Transients exist in a vast volume of observational parameter space and polarimetry has the potential to highlight sources of scientific interest and add value to near r…
Orbits of 14 binaries based on 2018 SOAR speckle observations
Docobo, José A.; Campo, Pedro P.; Horch, Elliott P. +4 more
New data obtained during the 2018 March-April speckle run at the 4.1 m Southern Astrophysical Research (SOAR) telescope located at Cerro Pachón (Chile) allowed us to recalculate the orbits of the following visual binaries: WDS 06478+0020 (STT 157), WDS 07003-2207 (FIN 334Aa,Ab), WDS 07013-0906 (A 671), WDS 10174-5354 (CVN 16Aa,Ab), WDS 12155-3106 …
Spatial and velocity offsets of Galactic masers from the centres of spiral arms
Vallée, Jacques P.
Some theories about the spiral arms of galaxies predict an offset between different tracers of star formation. Our goal in this paper is to find such an offset between the observed locations of radio masers and the locations of the arms, using a recent four-arm model fitted to the CO 1-0 gas. Our method is to compare a recent global four-arm spira…
Precise radial velocities of giant stars. XIII. A second Jupiter orbiting in 4:3 resonance in the 7 CMa system
Quirrenbach, A.; Grundahl, F.; Albrecht, S. +8 more
We report the discovery of a second planet orbiting the K giant star 7 CMa based on 166 high-precision radial velocities obtained with Lick, HARPS, UCLES, and SONG. The periodogram analysis reveals two periodic signals of approximately 745 and 980 d, associated with planetary companions. A double-Keplerian orbital fit of the data reveals two Jupit…
The Nature of the Broadband X-Ray Variability in the Dwarf Seyfert Galaxy NGC 4395
Kaastra, J. S.; Stern, D.; Brandt, W. N. +14 more
We present a flux-resolved X-ray analysis of the dwarf Seyfert 1.8 galaxy NGC 4395, based on three archival XMM-Newton and one archival NuSTAR observations. The source is known to harbor a low-mass black hole (∼ {10}4{--}{{a}} {few} × {10}5 {M}⊙ ) and shows strong variability in the full X-ray range during these ob…
The Hubble Catalog of Variables (HCV)
Hatzidimitriou, D.; Rest, A.; Georgantopoulos, I. +33 more
Aims: Over its lifetime and despite not being a survey telescope, the Hubble Space Telescope (HST) has obtained multi-epoch observations by multiple, diverse observing programs, providing the opportunity for a comprehensive variability search aiming to uncover new variables. We have therefore undertaken the task of creating a catalog of varia…
Probing Clumpy Wind Accretion in IGR J18027-2016 with XMM-Newton
Paul, Biswajit; Ferrigno, Carlo; Pradhan, Pragati +2 more
Supergiant X-ray binaries usually comprise a neutron star accreting from the wind of an OB supergiant companion. They are classified as classical systems and supergiant fast X-ray transients (SFXTs). The different behavior of these subclasses of sources in X-rays, with SFXTs displaying much more pronounced variability, is usually (at least) partly…
Pronounced morphological changes in a southern active zone on comet 67P/Churyumov-Gerasimenko
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +30 more
A smooth deposit in the southern Khonsu region has been seen in ESA/Rosetta observations as active during the second half of 2015, when the southern summer coincided with the perihelion passage of 67P/Churyumov-Gerasimenko (67P). Image color sequences acquired by the OSIRIS instrument in the period of January 2015 to July 2016, pre- and post-perih…
Excess H, Suppressed He, and the Abundances of Elements in Solar Energetic Particles
Reames, Donald V.
Recent studies of the abundances of H and He relative to those of heavier ions in solar energetic particle (SEP) events suggest new features in the underlying physics. Impulsive SEP events, defined by uniquely large enhancements of Fe/O, emerge from magnetic reconnection in solar jets. In small, "pure," shock-free, impulsive SEP events, protons wi…